AIR CONDITIONING SYSTEM, Diagnostic DTC:B1473/73

DTC Code DTC Name
B1473/73 A/C Inverter Start-up Signal System Malfunction

DESCRIPTION

The inverter activation signal is sent to the compressor with motor assembly from the power management control ECU. Compressor control is stopped and the DTC is stored if there is an open or short in the signal circuit.

DTC Code DTC Detection Condition Trouble Area
B1473/73 Open or short in compressor with motor assembly start-up signal system.

  • CAN communication system

  • Hybrid control system

  • Harness or connector

  • Compressor with motor assembly

  • Power management control ECU

WIRING DIAGRAM

A01FVMQE02

INSPECTION PROCEDURE

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • The hybrid control system and air conditioning system output DTCs separately. Inspect DTCs following the diagnosis procedure for the hybrid control system first if any DTCs from those systems are output simultaneously Click here.

  • If DTC B1498 is output at the same time, troubleshoot DTC B1498 first.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.


      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK HYBRID CONTROL SYSTEM


    1. Check if DTCs for the hybrid control system are output using the GTS Click here.

      Result
      Result Proceed to
      Hybrid control system DTC is not output A
      Hybrid control system DTC is output B

    B

    GO TO HYBRID CONTROL SYSTEM Click here

    A

  3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - COMPRESSOR WITH MOTOR ASSEMBLY)

    CAUTION:

    Do not disconnect the connector on the high voltage side.


    1. Disconnect the A36 power management control ECU connector.

    2. Disconnect the F16 compressor with motor assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A36-19 (STB) - F16-4 (STBI) Always Below 1 Ω
      A36-19 (STB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK COMPRESSOR WITH MOTOR ASSEMBLY


    1. Reconnect the F16 compressor with motor assembly connector.

    2. A01FVRYE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A36-19 (STB) - Body ground Power switch on (IG) 11 to 14 V
      A36-19 (STB) - Body ground Power switch off Below 1 V

    NG

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here